 It's commonly accepted that a bright sunny day has a positive effect on our disposition. Is there any reason we should hope for more dismal weather? According to Australian researchers, inclement conditions will improve your memory. During good weather, they say, our focus is scattered and directed outward, while somber moods induced by a gloomy day will turn our thoughts inward, sharpening our focus and helping us retain memories. So if there's something on your schedule that requires sharp mental focus, check the forecast.